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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
// First include the header file to be tested:
#include "itkConstantBoundaryImageNeighborhoodPixelAccessPolicy.h"
#include "itkShapedImageNeighborhoodRange.h"
#include "itkConstantBoundaryCondition.h"
#include "itkConstNeighborhoodIterator.h"
#include "itkImage.h"
#include "itkImageNeighborhoodOffsets.h"
#include "itkVectorImage.h"
#include <gtest/gtest.h>
// Test template instantiations for various template arguments:
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<itk::Image<short, 1>>;
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<itk::Image<short, 2>>;
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<itk::Image<short, 3>>;
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<itk::Image<short, 4>>;
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<const itk::Image<short>>;
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<itk::VectorImage<short>>;
template class itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<const itk::VectorImage<short>>;
namespace
{
template <typename TImage>
typename TImage::Pointer
CreateImage(const unsigned int sizeX, const unsigned int sizeY)
{
const auto image = TImage::New();
const typename TImage::SizeType imageSize = { { sizeX, sizeY } };
image->SetRegions(imageSize);
image->Allocate();
return image;
}
// Creates a test image, filled with a sequence of natural numbers, 1, 2, 3, ..., N.
template <typename TImage>
typename TImage::Pointer
CreateImageFilledWithSequenceOfNaturalNumbers(const unsigned int sizeX, const unsigned int sizeY)
{
using PixelType = typename TImage::PixelType;
const auto image = CreateImage<TImage>(sizeX, sizeY);
const unsigned int numberOfPixels = sizeX * sizeY;
PixelType * const bufferPointer = image->GetBufferPointer();
for (unsigned int i = 0; i < numberOfPixels; ++i)
{
bufferPointer[i] = static_cast<typename TImage::PixelType>(i + 1);
}
return image;
}
} // namespace
// When no constant is specified (which is the default), an attempt to retrieve
// a pixel outside the image boundaries should yield zero, for a scalar pixel type.
TEST(ConstantBoundaryImageNeighborhoodPixelAccessPolicy, YieldsZeroOutsideImageByDefault)
{
using PixelType = int;
using ImageType = itk::Image<PixelType>;
using RangeType =
itk::ShapedImageNeighborhoodRange<ImageType, itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<ImageType>>;
enum
{
sizeX = 9,
sizeY = 11
};
const auto image = CreateImage<ImageType>(sizeX, sizeY);
image->FillBuffer(42);
const ImageType::IndexType locationOutsideImage{ { -1, -1 } };
const itk::Size<ImageType::ImageDimension> radius = { {} };
const std::vector<itk::Offset<ImageType::ImageDimension>> offsets =
itk::GenerateRectangularImageNeighborhoodOffsets(radius);
const RangeType range{ *image, locationOutsideImage, offsets };
for (const PixelType pixel : range)
{
EXPECT_EQ(pixel, 0);
}
}
// When the constant is added as extra argument of a neighborhood range, an attempt to retrieve
// a pixel outside the image boundaries should yield this specific constant value.
TEST(ConstantBoundaryImageNeighborhoodPixelAccessPolicy, YieldsSpecifiedConstantOutsideImage)
{
using PixelType = int;
using ImageType = itk::Image<PixelType>;
using RangeType =
itk::ShapedImageNeighborhoodRange<ImageType, itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<ImageType>>;
enum
{
sizeX = 9,
sizeY = 11
};
const auto image = CreateImage<ImageType>(sizeX, sizeY);
image->FillBuffer(42);
const ImageType::IndexType locationOutsideImage{ { -1, -1 } };
const itk::Size<ImageType::ImageDimension> radius = { {} };
const std::vector<itk::Offset<ImageType::ImageDimension>> offsets =
itk::GenerateRectangularImageNeighborhoodOffsets(radius);
const auto numberOfExpectedNeighbors = offsets.size();
for (PixelType constantValue = -1; constantValue <= 2; ++constantValue)
{
const RangeType range{ *image, locationOutsideImage, offsets, constantValue };
// Test by using a range-based for-loop:
for (const PixelType pixel : range)
{
EXPECT_EQ(pixel, constantValue);
}
ASSERT_EQ(range.size(), numberOfExpectedNeighbors);
// Test by using RangeType::operator[]:
for (size_t i = 0; i < numberOfExpectedNeighbors; ++i)
{
const PixelType pixel = range[i];
EXPECT_EQ(pixel, constantValue);
}
}
}
// With this policy, ShapedImageNeighborhoodRange should yield the same pixel
// values as itk::ConstNeighborhoodIterator with itk::ConstantBoundaryCondition.
TEST(ConstantBoundaryImageNeighborhoodPixelAccessPolicy, YieldsSameValuesAsConstantBoundaryCondition)
{
using PixelType = int;
using ImageType = itk::Image<PixelType>;
using RangeType =
itk::ShapedImageNeighborhoodRange<ImageType,
itk::ConstantBoundaryImageNeighborhoodPixelAccessPolicy<const ImageType>>;
enum
{
sizeX = 3,
sizeY = 4
};
const auto image = CreateImageFilledWithSequenceOfNaturalNumbers<ImageType>(sizeX, sizeY);
const ImageType::IndexType location{ {} };
const itk::Size<ImageType::ImageDimension> radius = { { 1, 2 } };
const std::vector<itk::Offset<ImageType::ImageDimension>> offsets =
itk::GenerateRectangularImageNeighborhoodOffsets(radius);
for (PixelType constantValue = -1; constantValue <= 2; ++constantValue)
{
const RangeType range{ *image, location, offsets, constantValue };
itk::ConstantBoundaryCondition<ImageType> boundaryCondition;
boundaryCondition.SetConstant(constantValue);
itk::ConstNeighborhoodIterator<ImageType, itk::ConstantBoundaryCondition<ImageType>> constNeighborhoodIterator(
radius, image, image->GetRequestedRegion());
constNeighborhoodIterator.SetLocation(location);
constNeighborhoodIterator.SetBoundaryCondition(boundaryCondition);
itk::SizeValueType i = 0;
for (const PixelType pixel : range)
{
EXPECT_EQ(pixel, constNeighborhoodIterator.GetPixel(i));
++i;
}
}
}
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